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Take Command 25.00.17 crashing

I have a strange problem. I recently upgraded from TC21 to TC25. I'll open Take Command and do stuff, and all is fine, then randomly some time later (10-30 minutes), while I'm doing something else, Take Command will just disappear and a new TCC Prompt window will open.

It happens pretty much every time.

All I can see is a couple of events in the Windows Application Event Log as below. I can send the relevant files to someone if they'll be useful. Otherwise is there anything else I can do to try to track this down (I'm a software engineer, so you can tell me to do technical stuff ;-) )?

Faulting application name: TCC.EXE, version:, time stamp: 0x5d717cd8
Faulting module name: TakeCmd.dll, version:, time stamp: 0x5d717bba
Exception code: 0xc00000fd
Fault offset: 0x000000000041e428
Faulting process id: 0x7e74
Faulting application start time: 0x01d56942e131c0c2
Faulting application path: C:\Program Files\JPSoft\TCMD25\TCC.EXE
Faulting module path: C:\Program Files\JPSoft\TCMD25\TakeCmd.dll
Report Id: dc2ed182-3609-4d7b-b4f7-6fbcf29d232f
Faulting package full name:
Faulting package-relative application ID:


Fault bucket 1927774480199413653, type 4
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P3: 5d717cd8
P4: TakeCmd.dll
P6: 5d717bba
P7: c00000fd
P8: 000000000041e428

Attached files:

These files may be available here:

Analysis symbol:
Rechecking for solution: 0
Report Id: dc2ed182-3609-4d7b-b4f7-6fbcf29d232f
Report Status: 268435456
Hashed bucket: 2046d1de2dffe02adac0d4ad0b596f95
Cab Guid: 0
If TCMD disappears and a "new" TCC prompt appears, what is more likely happening is that something is breaking the TCMD <-> TCC IPC communication. In that case, in v25 TCC thinks that TCMD has either crashed or been killed by another process, and it will unhide the console window so you can save your work.

Try going to the TCMD configuration dialog, select the "Advanced" tab, and unclick "Close if no tabs exist". Then run TCMD again and see if the TCC tab window disappears (and reappears in a separate console window), and the TCMD window stays alive.
Yep, done that, and now I have a TCMD window with no tabs and a new TCC window

Also, I've noticed that TCC inside TCMD seems very 'laggy' (but it's OK in all the detached TCC windows, so that also could be because of a problem with the communication.

What next?
I've tried this build, and the lagginess has gone.

The TCC instance is still inside TCMD an hour later - normally it would have dropped out before now.

So, it looks promising :-)
Nothing else seems particularly slow or laggy. My PC is a i7-6800k @3.40GHz with 32GB RAM. There are a few hundred processes running (including >100 instances of chrome.exe), and using about 18GB at the moment.

If you can think of anything you want me to try, I can give it a go.

If you want, I can put back the original TCMD 25 to make the problem more visible.
I'm using BitDefender. I'll try putting back the original TCMD 25 and see if disabling the AV makes any difference.

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