Without any log posted from your part (please, follow the
rules for this forum !!!), I am reduced to guess work...
Try and clear your inventory cache, in case it would have been corrupted and would be causing excessive loading time: "Advanced" -> "Caches" -> "Clear inventory cache (after restart)", and relog.
Alternatively, in case your inventory would be too large to load before the watchdog times out, disable the watchdog (set the "WatchdogEnabled" debug setting to FALSE and restart the viewer).
If the above solutions fail,
do post a log here !