App updates disappear from Play Store after changing DPI?

I changed the DPI on my 610 and at the time I had like 6 app updates available including facebook, Twitter, maps, gallery, etc. Once I rebooted with the new dpi, the app updates were gone. When I went back to the original dpi and rebooted the app updates were available again. Any ideas as to why? I'd like to keep my changed dpi because I think the original dpi (240) makes things way too big in that small screen.

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Modifications to external SD card made in TWRP disappear

I feel like I'm going crazy. I make a Nandroid backup in TWRP (via "fastboot boot twrp.img" not permanently installed) and the backup finishes, I verify that it is there with the TWRP file manager, and then *poof* at some point it disappears. I don't even have to reboot for it to disappear. If I use the USB mount to try to copy the backup off of the device before rebooting, while still under TWRP, it's gone. I tried to use the shell to copy a folder, and *poof* it also disappears. WHAT IS GOING ON!!?!?!?! It's as though the external sd card is mounted as read only but TWRP is just pretending it can write to it; I've seen that with NTFS. But is that what's going on here? And why?