Just compiled and installed version 0.9.3 (only needed to install the latest libsamplerate library). The program seemed to work fine - it loads files, selects, copies, plays correctly.
When I copied a section, and 'Pasted as new', this worked fine too, but when doing a Save as…, using the WAV 16bit signed stereo format, Sweep just disappeared.
On the console this message appeared:
sweep: xcb_lock.c:33: _XCBUnlockDisplay: Assertion `xcb_get_request_sent(dpy->xcb->connection) == dpy->request' failed.
This seems to be a 'classic', and can be solved by:
export LIBXCB_ALLOW_SLOPPY_LOCK=true ; sweep
A suggestion: I'd really appreciate a field indicating the length of the selection (preferably updated 'live', while selecting).
No, it's not solved - about 50% of the time, 'Save as…' kills sweep with the same error message.