If you upload a new version of the test map, while its running on the server. It doesnt seem to fully update. I had to change map and upload it again for it take effect.
Yesterday I had a brush that was bumping up and down visually (you couldnt see it in spectator). The brush has recently changed from normal to surf texture and we seemed to think it was because the servers version of the map was different to the local version. I couldnt surf on the brush even though looking at it the client told me it was a surf brush. Once changing map and reuploading it was fine.