lavcodec AAC encoder fails: Too many channels?

[LigH]

According to a report in the german doom9/Gleitz board, Avidemux (2.63, 2.64, 2.66) simply quits when trying to encode multi-channel audio with the LAV AAC encoder; I even have an APPCRASH dialog, trying to confirm this issue. The end of %APPDATA%\avidemux\admlog.txt contains:

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[Lavcodec] Creating Lavcodec audio encoder (0xff)
[initialize] [Lavcodec]Too many channels
[Access] Encoder initialization failed
[Lavcodec] Deleting Lavcodec

Does this encoder not support more than 2 channels? The older FAAC encoder in Avidemux 2.6.1 does, but has other issues (low quality, noise in the beginning).