With the latest mcbans (3.5), we're receiving an error saying "API problem" or something similar in game when doing a ban.

The log shows this:
2011.11.28 01:13:20 {"error": "v2: Your version of MCBans is too old and no longer supported!"}

What's your server address?

mc.imdeity.com (web: http://imdeity.com )

Same errors are still being spammed in action log making mcbans completely useless. Config file, mcbans jar and language files were all redownload/recreated and issue persists.

Updated your version in the database manually. Try now and see what happens.

Issue resolved. Latest version seems to work

Nevermind. Still same problem:
2011.11.29 07:59:13 {"error": "v2: Your version of MCBans is too old and no longer supported!"}
2011.11.29 07:59:13 Sending request!
2011.11.29 07:59:13 {"error": "v2: Your version of MCBans is too old and no longer supported!"}

2011.11.30 02:04:34 {"error": "v2: Your version of MCBans is too old and no longer supported!"}
2011.11.30 02:04:36 Sending request!
2011.11.30 02:04:36 {"error": "v2: Your version of MCBans is too old and no longer supported!"}
2011.11.30 02:04:43 Sending request!
2011.11.30 02:04:43 {"error": "v2: Your version of MCBans is too old and no longer supported!"}

plugman info mcbans
02:06:29 [INFO] [mcbans] Status: Enabled
02:06:29 [INFO] Version: 3.5
02:06:29 [INFO] Author(s): Firestar and Crashdoom

Should be fixed now

Works thanks.