Have you tried to upgrade your server to a newer version? I have faced similar issues when I used QV server to host QVW apps created in newer versions; for that reason I try (when possible) to host Qiikview applications in the same version or at least the version -2 of the one used to create the Qlikview application, in your case, QV server 7.
Hope this helps you.
Hi Paul and thanks for your reply.
Yes, I've tried and it's works. But something that I can't understand is why some applications rans ok and some other no. Something is differents and after review and compare the code for both I can't figurate out what is it.