Many Timeslips problems are corrected rather easily by deleting the Preference File. We have never had any issues with this procedure, however, there is an undocumented problem that can occur if you accidentally double-click on the file. Here is what it looks like in your Timeslip program folder, using the "Tiles" view:
Notice the icon is the same one used to identify Outlook files. The reason is the ".PRF" extension is also used by Outlook configuration files. If you accidentally double-click on this file name, there is a danger of DELETING YOUR OUTLOOK FILES.
Fortunately, I have never seen this, however several other Timeslips Certified Consultants have reported this problem.
If someone in tech support suggests that you delete the PREFS.PRF file, make sure that you DO NOT DOUBLE-CLICK.