If your play store is not working, go into app settings, click play store and clear data. That should fix your problems.
For the Gmail error, just force close the app, and reopen it. That seems to fix it for me.
GPS seems to work perfectly for me!
And that's correct. Reloaded ICS makes it so you can't transfer files to sd card. And I never got adb to work. If you already have Reloaded on there and would like to remove it, and would rather not restore a backup, you can use root explore or astro to go into your files. go to system/app and delete the reloadedui.apk. Next, go into your sd card, and go to the CAI.zip ROM that you have on there. click it, click apps and long press systemui.apk. copy and go back to system/apps and replace the systemui.apk with the systemui.apk that you copied. then reboot and it'll be all good.