Pro tools mp9 wont open sessions

[austinerary]

(computer specs below)
Hey guys,
Im able to create sessions in pro tools MP9 using multiple virtual instruments and plugins. However when I try to open my sessions, there is trouble. Pro tools is able to run (loads all the plugins and what not), but then when it tries to load my tracks, it always gets hung up on one of them. Then I end up having to force quit pro tools because it isnt responding. Why is this happening? What can I do to help/fix this?

Model Name: MacBook Air
Model Identifier: MacBookAir5,2
Processor Name: Intel Core i5
Processor Speed: 1.8 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 3 MB
Memory: 4 GB

[guatamas]

can you open up a backup session?

it should be located in your sessions folder, under backup


See if that can help