No Data (Sleepyhead) again and again

I'm reposting my "No Data..." query in hopes that the solution proposed by Pugsy (establish a new user and reimport the data) is not the only one that works.

It seems that every time I bring up SleepyHead I run up against the problem and need to establish a new user profile. (I went to the SourceForge site to attempt to report the problem, but it's not clear how to do that.)

More Information:
1) If I go to one of my previous incarnations (users) and attempt to reimport the data the program refuses to do so.
2) When I establish a new user the message comes that says: "Please Import Some Data...It might be a good idea to check preferences first, as there are some options that affect import." Might a setting in preferences be causing my problem?

Have others been having this problem?

Thanks

Two thoughts come to mind:
a) Have you UNINSTALLED the Sleepyhead software from your computer and re-installed?
b) The SD card that you remove from your xpap machine has a little "lock" tab on the side. Usually a white slide tab. Is that in the UNLOCK position?
I'm wondering if the SD card is not recording your data at all, and thus not able to upload to your 'puter.

Hope you find a solution.

Jace