Comment 5 for bug 1505149

> intel_do_flush_locked failed: Input/output error
> 2.) Hugin started with disabled fast preview.

Both together indicate there is something with your graphic system (probably driver). Try updating your graphic driver.

> Now assistant crash when "searching for best crop rectangle".

Without more information we can't do anything. We need the pto file before the crash.
When the assistant crashes, start from begin, load images, then on the photo tab select "create control points" (with default setting), after this select "linefind" in the drop down box and select "create point points" again. Then save the project file and attach the pto file to this ticket. The images are not needed. We need only the pto file.