1PW iOS 4.2.0 (I didn't have 4.2.1 at that time).
iOS 6.1.3 (iPad)
I've tried to use 1PW 4.2.0, but the app went back to the 'finder' (actually not 'finder' but whatever it is called in iOS.)
I've tried to close the app and relaunched. It didn't solve the problem.
I've tried to reboot the iPad. It didn't solve the problem.
I checked the free space in the iPad. It was VERY low, about 25 MB. I deleted other apps to free space. Went up to 700 MB free space, but still 1PW didn't work.
I didn't find any other choice but to delete the 1PW app (along with the data) and reinstall. It downloaded the data from Dropbox. Now it is working again.
(BTW: all that is probably unrelated to having two data files on dropbox which I wrote in another post. This crash happened before I made any changes).
I have about 3400 items.
I am not sure, but I think that the size of the new data on the iPad (that came from Dropbox after the recovery) was much smaller than the data file before I deleted the App.
BTW2: what are those "Tombstones" that I saw in the log file?