Due to a bug in how paypal links contained in the renewal notices were generated, we have had to update the system a bit. This invalidates all existing paypal links you may have received prior to today. Links in subsequent (post-Apr20) renewal emails will be valid. If you want to use paypal to renew, you can request a new link to be issued to you immediately by emailing: membership@muug.ca The bug caused a very small number of users (about a 1 in 256) to see an error page when they tried to use their link. If you encountered this problem, we apologize for the inconvenience.