Land Desktop 3 can co-exist with the following products:

Land Development Desktop 2i with Service Pack 2 
Land Development Desktop Release 1 (except for remote binary install) 
Architectural Desktop 3.3 
Architectural Desktop 2i with Service Pack 1 
Architectural Desktop Release 1 
Autodesk Map 5 
Map® 2000i Release 4.5 
Mechanical 6 
Mechanical 2000i 
AutoCAD® 2002 
AutoCAD 2000i 
AutoCAD LT® 2002 
AutoCAD LT 2000i 
CAD Overlay® 2002 
Field Survey 
3D Studio VIZ® Release 3i

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Error - bad argument type: fixnump: nil

This error involves the adcadd_zz block which was either erased or is out of sync with the drawing. You need to run drawing setup with the appropriate layout current (you need not make any changes).

To find out which layout to set current copy and paste the following code to the command line and press enter:

(cdr (assoc 410 (entget (ssname (ssget "x" '((2 . "adcadd_zz"))) 0))))

The command line will return a layout name. Go to that layout and click Projects, Drawing Setup, then click OK.

You can put the above code on a button so it's handy. I get this error a lot...

Reverse pline direction without a lisp routine

1. Draw a new pline from anywhere on screen to the END (i.e. the intended new  beginning point) of the pline you want to reverse.

2. Pedit the newly drawn pline and use the Join option to add the original pline to it.

3. Trim off the pline you drew.

The resulting pline will be a reversed version of the original.

Migrating Express Tools

2i or above doesn't include Express Tools but they can be migrated from 2:

Before uninstalling LDD2, make backup copies of the following files:
express\*.*
support\acettest.fas
help\acetmain.hlp
help\acetmain.cnt
help\acetfaq.hlp

2.. Install LDT.
3.. Under the directory where you installed LDT, create a subdirectory named Express. 
4.. Copy all of the Express Tools files from the express\*.* file that you backed up in step 1 into the new directory you created in step 3.
5.. Copy the acettest.fas file to the support files subdirectory. 
6.. Copy the acetmain.hlp, acetmain.cnt, and acetfaq.hlp files to the AutoCAD Help  subdirectory.
7.. On the command line, type appload and press ENTER.
8.. Under Startup Suite, select Contents and choose Add.
9.. Select the acettest.fas file in the AutoCAD support directory. This will cause this file to load every time AutoCAD is started. You may have to restart LDD at this point.
10.. Type expressmenu on the command line.

Special Lines

A lot of users aren't aware that there are newer versions of the old "Special Lines" that actually act like polylines instead of individual line fragments. 

If you type linetype, then click load..., and File..., and select AeccLand.lin (in the support directory) there are replacements for treelines, chainlink and stockade fences, guardrails, and stonewalls that can be used as polylines. 

This makes editing much, much easier.

Map Work Space

A lot of users don't use Map and aren't sure how to turn off the workspace. I don't recommend avoiding Map (it has tremendous power) but the workspace does take up a lot of screen real estate.

To turn it on or off from the command line: mapwspace, off or on

To set it to not open at all: Map palette, Map menu, Options..., de-select "Show Workspace at startup".

Erase Duplicate Objects

A lot of users don't use Map and aren't aware of this great feature. If you've ever gotten a drawing in which a user has copied linework, text, etc. over top of itself you know what a pain it can be.

You can type ADEDWGCLEAN from the command line.

Or:

From the Map pulldown on the Map palette select Map, Tools, Drawing Cleanup...

The dialog box gives you all the options you need to clean up duplicate objects.

Renumber Attributes

On the LDD palette under Utilities there's a great routine that many users miss that allows you to renumber any number of attributes in a drawing.

Select Utilities, Edit, Number Shift 

The routine allows you to specify which attributes to change and in which blocks and by what amount.

Plots don't use selected plot table

I've had a few clients send me drawings in which the plot style selected seems to have no effect on the plotted output. Usually this is on drawings received from outside their office (even those done with LDD2/2i).

The quick fix is to re-run the setup for the layout. Right click on the layout tab, select Page Setup, select the correct plot style again and press OK.

Add Dimstyle item to the Object Properties Toolbar

This is the toolbar at the top of the screen that displays an objects layer, color, linetype, lineweight, etc. You can add (or remove) items by editing the **TB_OBJECT_PROPERTIES section of acad.mns (in your support directory).

You should ALWAYS make a backup of this file before editing it.

Open acad.mns with Wordpad and search for **TB_OBJECT_PROPERTIES. 

To add a dimstyle item add the following:

[_Control(_Dimstyle)]

You can then select a dimension and change it's dim style by selecting a new one out of the list.

Error opening point group database

2 causes for this error:

1. The groups.mdb is read only (find the file in explorer and remove the read only attribute).

2. The file was opened with Access 2000 (convert it to "Previous release" using Access2000).

Incorrect Query File in the AcadMap.ini file

You might get this message when starting LDD. On the Map pulldown under Options, click on the system tab and make sure the "Default query file directory" points to a local directory instead of a network UNC path.

"ai_molc Unknown command"

You might get this message when clicking on certain commands ("make objects layer current" for instance). 

The problem is with the function definitions in the acad.mnl file.

There are 2 fixes:

1. Manually load the acad.mnl file.

On the command line, type (load "acad.mnl") and press ENTER.

2. Make a copy of the acad.mnl file with the same file name as the MNU file.

Make a copy of the acad.mnl file. 
Rename the copy of the acad.mnl to the same file name as the main MNU file you are loading. For example, if you are loading mymenu.mnu, rename the copy of acad.mnl to mymenu.mnl. 
Restart LDD to load the MNL file you created.