Lossless files over 450 Kbps don't work

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Hi

I'm using Subsonic now since 2 days and I'm very enthusiastic about this great program.

But, I'm having trouble listing to music in Lossless with kbps over 450?
All is set to standard and other files with 256 kbps in lossless works.
Any idea what I'm doing wrong?

Thank you for your help.

All the best.