After posting the above, I played four lessons, also on medium resolution. More over, they were played on an old, tiny W7 netbook (2GB RAM :eek: ) on moderately slow DSL Wi-Fi. Two of the lessons were Song lessons; one a whopping eleven and a half minutes long, and the other two were from Level 2 Country Style and Blues Style respectively.

All four started quickly and ran smoothly to completion. No buffering/stutter problems, no interruptions. If you are still having problems at the time I wasn't this is a good, but not conclusive, indication that the issues lie with your system or configuration or your ISP or backbone nodes between your ISP and GT servers. Or a combination. This increases the importance of providing specifics to Admin/Help Desk.

Be patient...good luck!