there was another topic on this, but it was resolved without the need for a solution, and mine may be slightly different.
i generally use the android version of the app for my day to day time tracking problems. however, i enjoy kicking back with the ipad when it comes time to do my invoicing.
the problem started a few months ago, but i've just now taken the time to look into this. it happens as follows:
if i click on the invoices tab, and choose "export invoice", i am presented with a list of invoices. the moment i click on an invoice, the normal preview/print, email to me, email to client, etc. screen starts to load and the program crashes.
in an effort to troubleshoot this, i have done the following:
* updated ios to v.9.1 (was on 9.01, but this was happening on ios8, which was why i upgraded to 9 in the first place)
* removed and reinstalled time master completely.
* synced with my android device, rather than restoring backup (it took a lot longer, but no change).
**** edit. i decided to pull out my old iphone 4s running ios 8.2 just to see what happens. it crashed immediately. i then decided to try an old backup to see if it is some issue with the database. restoring a backup from march worked great, and it lets me export invoices perfectly.