An Internal Server Error after clicking Searching/Requesting is often a sign of a home or office computer that has internet blocking or personal firewall software. The buttons on the following screen are painted by a script run on the local computer, which may be blocked the software. For helpful hints on how to ajdust this go to the following links:

Internal Server Error after clicking Searching/Requesting in Patron Menu: Helpful Link 1 (MLIN)

Internal Server Error after clicking on Searching/Requesting in Patron Menu: Helpful Link 2 (SIRSI-Dynix)