Media Uploader en Activity (firefox freez + can not play mp3)

Wp 3.5.2 BP 1.7.2

When using Media Uploader to upload mp3 files

1) I can only upload 1 file, if 2 it will give me a “Sorry update post error” (not exact frase) 2) After upload is done and I click post after like a few secs mozilla completely freezes. 3) With Chrome, I can not play the mp3 file

See images:

Firefox freezes Chrome cant play file

When using Default buddypress theme, the button attach media, doesn't work at all.