Tell me the whole version of qlikview ( ex.11.20.12345). Now can you explain about QVS crashing, do you mean that the Qlikview Service goes shutdown? or only the browser?
For the application that fails in Ajax, can you create a new sheet ( blank) and save it on that blank sheet and try to open it again in ajax, if that works, that means that in the tab that you are trying to open, ajax cannot handle. for that it you must do the elimination process, by going back to the sheet in trouble, then eliminating each objects within that sheet until you are able to open the document without problems, for that the last object you removed place it on a separate sheet and see if that errors again, in that case you might have found a bug. For that you may report it to you respective Qlik support. You have to provide sample QVW and detail steps and tell them the trouble object.
I would also try to upgrade to the last patch of Qlikview V11.20 SR7.
Akbar, This happened to me once in 11.2 sr5.
I had some junk characters in list box due to which I could not view the entire sheet.
But if you try to navigate to some other sheet it works fine.
Then I tried to remove objects one by one and switch to web view to check if the issue still exists. Once I deleted junk character list box it work fine. It was temporary work around.
Migrate to sr6 worked for me, I would suggest to go with 11.2 sr7.
But I haven't tried SR7 myself.