After opening an existing Taxcycle file and then trying to open the linked Doxcycle file Taxcycle has locked up (Not Responding) requiring an end task to get going again.
Tried to just start Doxcycle after this with no luck. Doesn’t start.
Have tried a few times with same result on a few different files.
Thank you Arliss, We will take a look at that today.
After rebooting computer, Doxcycle will still not start at all now. 
Edit: I have reverted to the old version for now. Seems to work as expected now.
Can you please send me your TaxCycle and DoxCycle logs from around the time this happened please. You can email those to info@taxcycle.com to my attention.
There was no error messages generated.
Just the behavior mentioned previously.
With the previous version of Doxcycle installed everything has been behaving as it should.
You may not see the errors in the front end of the software, but there may be a clue for us in the log files to trace what may have happened. I am sending you a private email to follow up.
I have exactly the same problem as Arlis described.