All applications missing after migration from 6.6 to 7.6

Did you directly migrate from 6.6.1 to 7.6? Please read the migration instructions as you may be required to migrate to an earlier version before migrating to 7.6
Secondly, have you migrated the accdocs?

I migrated 6.5.1 to 6.6.1, that works fine I can see the applications, rules, reports and etc..
Then I migrated 6.6.1 to 7.6, but I don't see any application, rules, reports.
I did migrate accdocs, I compared the size and they look fine. I can try to migrate again.

There was a new folder called shared added under_/admin for ver 7.2 There were changes to the way JDBC connection names are to be defined as well. Have you gone through the migration guide for all the versions between 6.6 and 7.6? I suggest you take a moment to go through each of the version to ensure you follow the required steps and procedures.

I think 6.7 and 7.0 where major releases (can be more). Please check migration guide if there are any specific requirements for migration.