VitroLib stalls when creating multiple user accounts one after the other

[michelleif]

I tried to create a bunch of user accounts. After doing 2 or 3 in a row, VitroLib seems to stall, just goes to a blank screen while it is working, and then I got the below error a couple times (second time was at 12:49 PM PST on 10/24/16). But the accounts were created successfully.

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, [no address given] and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.