If you join a pogo lobby and after trying to load a table, if you notice a purple spider in the spot where you sit, it's pogo maintenance and not your pc.
A few steps for maintaining room and table loading are:
clean history, temporary internet files, and cookies.
Make sure your pc is running the latest java update. you can go to the java official site for testing, repair, updates, and download.
Pogo uses Adobe Flash also. Go check for the update on it's official site.
The keys vt are referring to are in the case your pc has a pop up blocker that you don't know how to locate in your one of the browser's privacy or security tabs in the options.
those two keys on the keyboard punched and held together while loading a table are: ctrl+alt.