Recently Garrisonbuddy hasnt worked on my Death Knight, it works on all of my other characters.
Tried clean install removing mesh etc nothing has worked.
After I press start he just stands still after "possibly" checking taxi map.
We've opened HB-2777("Toon quits moving while using Garrisonbuddy") against this issue. Your failure mode is quite distinct from the similar HB-2758("Harvesting the Mines problem on Garrisonbuddy with map SMVAllianceGarrisonLevel2") that is already open.
The only work-around that might be available to you is to remove the entire mesh folder located in %LocalAppData%/Bossland/Honorbuddy/Meshes. This will force Honorbuddy to re-download the latest versions.
Since you seem to be the only one having this problem at the moment, the problem could also be an interfering program, and it would be worth it to thoroughly check:
Tried removing mesh folder, now the bot wont even change from "Start" to "Stop" when clicking while using Garrisonbuddy, all other bots like Questing and Lazyraider working fine though, checking for possible interference.