Delphi Form Drag Lockup

Question

Make a Delphi 2007 application, TForm as main window. Run application. Try to drag the form using the caption bar. The debugger shows an unending stream of error messages, complaining it can't find some unnamed routine. Escape and Break don't work. 3 finger salute doesn't work. Clicking in some other window and then back to the Delphi application stops the avalanche of error messages and allows the application to function in its original location (the form itself hasn't moved).

Strangely, on occasion I've had related behavior using Firefox -- clicking in the browser window doesn't work 'til I click in some non-Firefox window, after which the browser window is active again.

Anyone seen related behavior? Suggestions? Might it be a mouse driver problem? Toshiba laptop with ALPS touchpad mouse.

Answer 1

I know there was a Logitech driver hook problem when starting a Delphi project in Delphi: it gave an exception on the first line of the .dpr. Outside Delphi it worked OK.

So do you get those exceptions/problems only in Delphi? What kind of error/exceptions?

Answer 2

This doesn't sound related to Delphi specifically. The "stream of error messages, complaining it can't find some unnamed routine" sounds very odd. Could you post one or two of the actual messages, please?

In the meanwhile, my guess is some form of hook or injected code. Try looking for programs that do that kind of thing and disable them one by one:

• Mouse drivers (as a poster above said)
• Antivirus, especially the "big ones" like Norton etc
• Some display driver "enhancement" utilities
• If you have two screens and you're running a second taskbar program, try that

and so forth.

It's probably worth doing a virus scan too, you never know :)