ActiveSync and SBSH PocketWeather v 1.3.6 don't like each other!!
http://forums.sbsh.net/index.php?showtopic=17065
http://forums.sbsh.net/index.php?showforum=28
I had no problems until about a week ago..... and then update on pocketweather started to have problems...and then ActiveSync 4.5 refused to sync.....
Solution (for now)....for me....uninstall pocketweather

(I need to be able to sync other info more)....until they come up with a patch/fix/solution.....
Just thought I'd pass along the information....for others who may have suddenly started having problems syncing.......
Susan