Timeslips version 2006; 14.0.0.32

OS: Windows 7 Professional

I've been using TS 2006 for awhile on this workstation without any problems. This last billing cycle, the dates of expense slips were altered to that of the invoice date. So expenses that had been entered mid-month, for example, had their date changed to the beginning of the next month (when invoices were generated, prior to selecting the stage).  And it wasn't just that the dates were incorrect on the invoice. The slips themselves were changed when I looked them up through "Show Slips". 

It only effected expenses however -- timeslip dates and payment dates remained unaffected. It also did not effect any expense slip that had been approved (thankfully).  Is there is some function in TS 2006 that automatically changes the dates of expense slips to that of the invoice generation date, that maybe got accidentally activated?  

I had to approve bills and send them out today, so I set the billing date to the 2nd, which insured that about 50% of the dates were correct. However, as I go back and look through expense slips, it appears that approving the bills created duplicate expense slips for all clients that had expense slips this billing cycle...