Your problem looks more related to using automatic injection than using transaction correlation. To verify this, (1) you can disable transaction correlation and enable automatic injection and verify if the problem with application access occurs or not?
(2) Next enable transaction correlation and disable automatic injection and agian verify if the problem with application access occurs or not?
If my guess is right you should see issue in test case 1 and not in test case 2. Let me know in case you observe otherwise. If so this mostly happens due to incorrect placement of the js agent. Refer to the below link for more info:
And verify if you have any <META> tags before your adrum script in the page source code.
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