Arch Linux

This is happening only in x86_64 cause the i686 version is still 0.60
I think this is how this can be solved:http://alien.slackbook.org/blog/gtk-icons-suddenly-missing/

glib 2.22.x and gtk2 2.18.x are fully compatible with shared-mime-info 0.70. As noted in the comment by Greg, there could be issues with caches in your profile. We can't alter profile data from the package, so you need to fix the cache files in your profile yourself.

I'm pretty sure I deleted all my caches with no success when I first discovered the problem. But if it will fix this, would you mind telling me where the files can be found?

update-mime-database ~/.local/share/mime

That should fix your problems.
Note that the cache format has changed, and older versions of glib, gtk and gnome-vfs have problems with the new format. Reading the forum post, I see people downgraded their GTK because of flash problems. This is not a supported configuration.

Sorry. After upgrading again and running that command I still have the same problem.

Does pcmanfm have its own parser for the mime cache? With the previous update we also had these problems, which was caused by the same problem.

Confirmed .
I don't have a "~/.local/share/mime" dir .
I deleted everything not owned by a package(everything but packages/) in "/usr/share/mime" then ran "update-mime-database /usr/share/mime" .
The problem still persists in PCManFM .

Only downgrading fixes the bug.

This gentoo bug describes the same problem:
http://bugs.gentoo.org/show_bug.cgi?id=288820

It appears shared-mime-info 0.70 introduces a new cache format, which is not supported by PCManFM.

Reported on pcmanfm sourceforge page: https://sourceforge.net/tracker/?func=detail&aid=2883172&group_id=156956&atid=801864

According to this:
https://launchpad.net/bugs/444962
(note: retrieved from Google cache because the site itself isn't responding to me)
...the problem is in glib, and it has supposedly been fixed in glib:
http://git.gnome.org/cgit/glib/commit/?id=7c27df1feeea1d6ab8b927285cecc4ac34db8b06
http://git.gnome.org/cgit/glib/commit/?id=e1643fd76daf66ccffd9e6818e4f4ec8272e2a51

Also suggested at that link was the somewhat more specific fix, "update-mime-database.real -V ~/.local/share/mime/", which I haven't tried because I also downgraded to solve this problem when I experienced it. (And which, by the way, seemed to affect rox-filer as well as pcmanfm for me, so on my box, it isn't just a pcmanfm issue.)

I think rox-filer also contains custom code for the mime cache. The glib commits have been applied to the 2.22.2 release, which is the current version in our repositories.

The bug report on the PCManFM sourceforge page states "fixed" now (from this afternoon). Maybe an upgrade of the package solves the issue.

Attached is the patch that was committed to upstream pcmanfm SVN.