Then I right-click and select 'Set Affinity' - this allows you to restrict the CPU cores that can actually run the multiple threads used by Camtasia. What I tried is this: I opening Camtasia, and with the Task Manager, I locate the process under the 'Details' Tab:

So it seems to be some sort of multi-threading issue. The hang type 'Cross-thread' is usually generated when a secondary thread (think of a thread like a sub-process running inside a process, that can use a different core to run tasks in parallel) tries to manipulate the User Interface - something that must only be done only in the main thread. The interesting bit is the log entry generated: Windows 10 reports the application is unresponsive, and force-closes it.

Camtasia 2021 will change the cursor to a cross-arrow and hangs indefinitely. I can trigger the hang usually by going to the 'media bin' appartment and hovering the mouse over any of the recordings. Hi everyone, I'm experiencing the same sort of problems, and found a workaround (not definitive), but at least I can significantly reduce the frequency of the crashes I'm experiencing).

Camtasia 3 freeze frame