It's iMac with 5k monitor. @wuxiaowei (cjxw87) indeed you should check the activity monitor if it's CPU or GPU thingie.

Well, yes, they should, as long as 'Alpha' setting just below blend mode is enabled… Disabling it will lock the alpha channel. Thanks for the report, but no bug here.

After talking with Campbell, have decided to close this one for now. If we can reproduce that second issue in 2.8, then can reopen with a repeatable test case (using script or knife project).

Can confirm the issue, but not so sure we can do much about that, this looks to me very similar to the terminator problem in rendering… @Campbell Barton (campbellbarton) or @Brecht Van Lommel (brecht) may know better?

There are two things going on here and I am not sure which you are trying to report.

@Arto Kitula (akitula) not sure what is an 5k IMac… is it even supposed to support Blender? :P

Please follow our submission template and guidelines, also read these tips about bug reports, and make a complete, valid bug report, with required info, precise description of the issue (only ONE issue per report!), precise steps to reproduce it, small and simple .blend and/or other files to do so if needed, etc.
Videos and/or links to external sites etc. are not acceptable as bug report (they can be provided as additional information only).

This bug is still around in version 2.79. Even if in preferences File > Compress File is set, after closing and reopening the compress option is ignored.

waooo thanks so much this information worked for me too..... my blender is now working fine and faster

Issue is not present in rB78c2063685cb6e0d0bcb895cf4eb70686455d596
Issue is present in rBdb333d9ea4881d9f48e3cc4b1ec59b4dafb27cc0

This was not the behaviour in rB7f86afec9d6

Default font and zoom size, hinted looks terrible:

Hinting can sometimes add space between characters, but that does seem rather a lot.

AL Lib: (EE) UpdateDeviceParams: Failed to set 44100hz, got 48000hz instead is just a notice about the sound preferences and can be disregarded.

Please check existing reports!

Thanks for the quick reply.

there's some discussion about this in D3581 as well.

Change caused by rB18888b7b0c3556d. So would say that is expected behavior, will let @Campbell Barton (campbellbarton) make final decision here though.

Thanks for the link to CUDA-Z! Very helpful tool.
It is a system wide problem and not blender-related.
I passed this error to the GENTOO developer crew.
This task/ticket can closed.

Please check:

• If there is a separate package that needs to be installed for CUDA support.
• If there exists a libcuda.so.1 or libcuda.so in your computer and where it is located.

Thank you! It was really no pleasure to work with blender the last couple of days ;)

You can disable "Text Hinting" in User Preferences > System.

Still helps to start from last-working-point… Issue is likely in convert-to-curve operation, will check. Also, has nothing to do with cycles, happens with BI materials too.

Confirmed, @Brecht Van Lommel (brecht) not sure if that’s known limitation or actual bug?

Please try the latest build from our buildbot, think that issue has already been fixed.

@Bastien Montagne (mont29) If you save the file, it will not crash anymore. You need to reproduce exactly this steps.

Thanks, confirmed.