I use wine to run Topaz Denoise, a photo processing software.
(One of) the last updates broke this:  The program no longer starts, on the
terminal I can see 

fixme:system:SetProcessDPIAware stub!
err:module:import_dll Library Qt5Svg.dll (which is needed by L"C:\\Program
Files\\Topaz Labs\\Topaz DeNoise 6\\imageformats\\qsvg.dll") not found
fixme:heap:RtlSetHeapInformation 0x31d0000 0 0x23e860 4 stub
fixme:font:RemoveFontMemResourceEx (0x87630d51) stub
err:seh:setup_exception stack overflow 1584 bytes in thread 00a9 eip
000000007bc9a589 esp 0000000000140fe0 stack 0x140000-0x141000-0x240000
^Cerr:seh:call_stack_handlers invalid frame 3a3fff0 (0x3a42000-0x3b40000)
err:seh:raise_exception Exception frame is not in stack limits => unable to
dispatch exception.

It does not terminate, I have to press CRTL-C to get command line back.

As the last updates AFAIK have only been rebuilds without changes I assume it
might have been the gcc7 recompile 2.6-1.6, though I am not sure if I actually
ran Topaz Denoise with 2.6-1.5.

Other programs (e.g., the NIK collection) still run.