Selecting any button from the AutoCAD ribbon creates the fatal error.  Typing or using a toolbar does not create the error. 

AutoCAD Error Aborting

FATAL ERROR: Unhandled e0434352h Exception at 6C6CCF19h

Sometimes followed by;

The program is missing Tool Palettes and Ribbons.
The drawing may briefly open and then crash.

In HydraKEY, the "Authorization Number" is displaying a number that is not yours or you are receiving software that is not yours, and failing to Renew your own Authorization Number, or get your own software.  In the HAM log, visible only to Hydratec Employees, the Authorization number is being used on machines at different companies.

Dimensions are visible in paper space but not in model space.

Do not only include an image here!
Image dimensions should be set to height=100% width=100%, you can do that by double clicking the image.
This is placeholder text and should be changed.

Command Failure for External Command... System.NullReferenceException

When running the AutoCALC process, it hangs at step 2.4e "Re-Loading Calculated Data - AutoPeaking Data"

May also happen around steps 2.3, 2.4a, 2.4b, 2.4c, and 2.4d

No error... but the view shows up in the project browser but quickly disappears after and cannot be accessed. 

Command Failure for External Command... System.NullReferenceException

Unhandled exception has occurred in your application. If you click
Continue, the application will ignore this error and attempt to continue. If
you click Quit, the application will close immediately.
Could not load file or assembly 'Newtonsoft.Json, Version=13.0.0.0,
Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed" or one of its
dependencies. The located assembly's manifest definition does not match
the assembly reference. (Exception from HRESULT: 0x80131040).

When clicking the abacus to enter a length, you get this error;

Unhandled exception has occurred in a component in your application.  If you click Continue, the application will ignore this error and attempt to continue.

Index and length must refer to a location within the string.  Parameter name: length

When clicking the abacus to enter a length, you get this error;

Unhandled exception has occurred in a component in your application.  If you click Continue, the application will ignore this error and attempt to continue.

Index and length must refer to a location within the string.  Parameter name: length

When clicking the abacus to enter a length, you get this error;

Unhandled exception has occurred in a component in your application.  If you click Continue, the application will ignore this error and attempt to continue.

Index and length must refer to a location within the string.  Parameter name: length

When plotting two viewports, one with center-to-center lengths, and the other with cut lenghts, the riser nipples/vertical pipes will show both, even if your layout tab looks fine.

LAYOUT TAB

PLOT PREVIEW

While trying to process a job you get this error;

Processing Reports, Writing .HLPF file > Total page count: 1

The VSPrinter control is emptly (no document to translate).  Please close the PDF file before processing

No error, but the section's background becomes blue / light blue after placing down the supply point

When doing a Save As a file is created called Dummy.

No error, but my 90-degree elbows aren't showing up in coarse detail view.

Printing a final calculation to PDF creates a blurry or pixelated cover sheet logo

When attempting to 'Start AutoLIST' (SAL command), user gets an AutoCAD Fatal Error.