1ef7b65-131119 Creative ZEN - Screendump issues

[chrisjj]

I'm having trouble with Screendump on version 1ef7b65-131119 on Creative ZEN.

* Each USB insert takes dozens of dumps rather than just one
* Subsequent inserts don't take any
* The mode seems to revert to disabled without asking
* Attempt to capture a page such as "Database is not ready  Initialize Now   PLAY = Yes  Any Other = No" fails, returning the screen to the previous page.

Anyone else found such issues?

Also note: I've found the capture of a corrupt display can be false - it shows an uncorrupt version. Since screendumped data comes from the Rockbox framebuffer rather than the LCD itself, I guess this means the corruption is not in the framebuffer but instead in the transfer to the LCD.