This problem occurs in both FSX and P3Dv2.1.
Once the FSX/P3D started, the message box attached appears few seconds later. The Couatl.err keeps saying "unsupported locale setting"
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couatl v2.0 (build 2358)
panic log started on Mon Apr 07 21:20:10 2014
problem raised by addon <unknown>Current locale is
Traceback (most recent call last):
File "couatl\common\__init__.py", line 31, in onAppStart
File "C:\Progetti\FsxTest\debug\locale.py", line 478, in setlocale
locale.Error: unsupported locale setting
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My PC is running Windows 8.1 and the System Locale is "English (United States).
Thanks!