If LSDj boots and doesn't detect SRAM on the cartridge, the most likely culprit is a dead or disconnected battery. Batteries aren't perfect technology, stuff happens to them even when they are new sometimes. :-/
If you have any kind of information in SRAM currently that you want to save, back it up before you do any of this the following. Now take the cart apart and make sure that the battery is firmly seated in the battery clip, and try it again. If the battery is new, it might have just unseated from the battery socket—wiping your SRAM in the process. 
As for the other stuff:
1.) I'm not sure what you are describing as the problem with the other page, exactly.
2.) If you are having problems with only one "page" on the EMS GB USB 64M, just reformat and flash that page. I've had a cart that was only in use for about a month get the ROM corrupted somehow (I think I was trying to run software that crashed the game boy), and I just reflashed it and it was fine.
The "Pages" functionality is kind of confusing at first, but once you get used to it, it's pretty cool. 
Also, this isn't a nonfinite issue, for the record. These are the same carts everyone can get now, and they have some pretty well documented reliability issues. You'd be at risk for having the same problems no matter where you got it.
EDIT: A Tip for Pages
If you're worried about accidentally overwriting your SRAM on the GB USB 64M, I'd recommend only keeping programs that do not access SRAM on Page 2—things like MuddyGB, GB Electric Drum, Pounder, UCBN, and whatever else you'd like.
There was a decent thread about this subject a while back.
Last edited by Telerophon (Jul 19, 2012 10:24 pm)