WGT is very browser sensitive. If your browser isnt clean and up to scratch , you will experience meter problems.
I would try first of all clearing your browsers Cache to see if that helps. (Click anywhere in a white space on your browser and press CTRL/SHIFT & DEL to bring up the cache options)
Its also important to clear your browsers FLASH CACHE from time to time.
(Right click on the big PLAY NOW button on the left in WGT . Select 'Global Settings' and then go ahead and follow the prompts to DELETE ALL.)
Many here use Maxthon or Comodo Dragon exclusively for the WGT game.
I use Maxthon, but it is important to go into the settings and turn off the 'proxy' feature once installed
http://www.maxthon.com/.