Conflict with SAP BusinessObjects Analysis in Excel
Problem
think-cell and SAP BusinessObjects Analysis (AO) are enabled concurrently. I open two Excel files, at least one of which contains SAP functionality. When I close my Excel file with SAP functionality, I receive an error message, e.g.:

Other error messages, which may occur instead:
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CRITICALWITHMSG library\ui\dpi_win.cpp(81):
VERIFY(tc::ui::win::g_dlluser32dpi.GetDpiForWindow(wnd))
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CRITICAL library\objecttypes\obj.cpp(40): _ASSERTIF m_nRefCnt=1073741825,
(unsigned int)0x40000000=1073741824
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CRITICAL library\ui\win\safesubclassimpl.cpp(239): _ASSERT(0!=lResult)
Solution
The problem was fixed in SAP AO version 2.8 SP4
Cause in previous SAP AO versions
Our developers analyzed the issue in detail. According to our analysis, hooking/unhooking issues caused this problem when multiple add-ins were available. This problem was originally reported for SAP BusinessObjects Analysis (see SAP ticket 557711 / 2018) and for SAP Business Explorer (see SAP ticket 1019869 / 2011). As SAP Business Explorer is in maintenance mode at SAP, a fix for SAP BEx is not expected.