Can you test if you have the same behavior with the standard Joomla Login module (mod_login)? The SCLogin module is an improved version of that module, but the straight-up Joomla login portion was pretty much copied from the Joomla login module. That would be a great test to determine where problems are occurring.with any type of cache turned on I keep getting invalid token problems.
If you have the redirection set to "Same Page" and then are caching the module, that would explain the behavior. Basically, a user is logging into the "Same Page" that the first user was on when the module was cached. I would recommend using a menu item redirect if you're caching solution is going to save the redirection like that.Also when it does login it will just jump to a random page on the site most of the time?
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