powerpoint 2010 sp1 application crash under rds 2008 r2 sp1

hi,

we use rds 2008 r2 to train 30 users for office 2010 sp1 and lately we get stop working msg

for detail please refer to the above link

https://docs.google.com/document/d/1T8LPikjk0ZoVqUr4YdMuI4ia-MeM-ZOf8WU7TTxnwQ8/edit?usp=sharing

any solutions, ideas how to fix it ? 

thanks

eric

eric