If some has been getting error messages that say "Invalid Session" when they try to post or register, it may be that they are using AOL as their Internet Service Provider (ISP). AOL and some other ISPs don't have a single block of IP numbers, but the numbers they use to identify their servers can change dramatically. This causes programs like our board to reject their attempt to register or post because the program sees them as hackers.
Please let me know if anyone reports trouble, so I can work on the issue.