Ive been having this happen recently, something that hasn't been happening, and event viewer is displaying this error report:
Faulting application name: pol.exe, version: 1.18.13.0, time stamp: 0x4e3bcddc
Faulting module name: luacore.DLL, version: 2.2.1.3, time stamp: 0x5b20ee35
Exception code: 0xc0000005
Fault offset: 0x0010635b
Faulting process id: 0x954
Faulting application start time: 0x01d4383897e143cd
Faulting application path: C:\Program Files (x86)\PlayOnline\SquareEnix\PlayOnlineViewer\pol.exe
Faulting module path: C:\Program Files (x86)\Windower4\plugins\luacore.DLL
Would removing the luacore.dll and having windower reload it possibly fix this issue?