This morning I posed an update to my Sandbox-SwimTeam theme. This update addresses a number of CSS bugs which primarily affected the login page.
If you updated to any of the wp-SwimTeam v1.16.x releases you must update again to v1.17.707. I inadvertently introduced a bug which prevented almost all of the registration (season, swim meet, etc.) actions. I quickly fixed this bug once I became aware of it, I apologize for any inconvenience.