Unreliable

I have not updated to Mavericks, but have serious problems with Camtasia doing strange things. It loses clips and cannot save, even with plenty of disk space. Then it corrupts the previous version of the files, so they cannot be opened. Currently waiting several minutes to shut it down so I can do a Restart and see if that helps it.
Its latest trick is to show me the part of the screen it is going to record, then record something different! So I had to re-record the video part, and keep the sound track of the original (I didnt want to record tht again), then go though and cut out all the transitions, position them, then duplicate all the bits in between.
Surely there is something better than this, that doesnt produce such large files. There has to be a better way.

Nicknames_are_a_daft_req about Camtasia 2