SSRS Toolbar - Search function

Hi,

we are using AX 2012 R2 CU6.

In some of the standard SSRS Reports, we`re facing the problem, that when a user uses the search function in the report toolbar (axreportviewer) the report gets blank and can only be reloaded.

Reports were redeployed, system compiled and full cil was made. There are no errors in the ssrs log. AUC, KTI Files and usage data were deleted for the users.
Any hints?

Thank`s