We are using Stencyl. Have you checked if it’s the proxy?
We are using Stencyl to complete the level 5 Assets outcomes with an example game. We are then giving pupils a choice of software for final project. Check the stencyl forum for information on getting it working. The access to Stencylforge is a must.
We are insisting on our pupils using the Internet and Stencylforge for sourced assets but luckily SF gives license details. nice.
Out of interest, what other software are you using? We are looking at Sauerbraten and NetRadiant/Warsow for 3D and Adventure Game Studio for adventure games.