I'm wondering whether there's much chance that this fine little app might be rendered fully portable - that is: no registry entries added / changed; no temp files (nor any other traces) used / left behind - perhaps in collaboration with the folks at PortableApps.com, so that it could be used on any computer, from just the one installation on a USB drive?

My OS: Windows 8.1 64 bit with all latest updates
Program version: latest (4.5.1)

The problem: When in program settings I set "Dropping" to "Open with" and when I drag any file from Windows Explorer to taskbar button with a program I get cursor "Unavailable". And a window of program, on which I hold cursor, doesn't activate.

This problem exists only on 2nd taskbar on my second screen (I have 2 screens)

hibernate functioning ok. Coming back from hibernating not functioning. Never receiving an error message!

here are a list of my files...

7+ Taskbar Tweaker.exe.5760 .dmp 682,622 .a.. 2014-07-10 16:11:22
7+ Taskbar Tweaker.exe.3004 .dmp 726,117 .a.. 2014-07-09 21:16:54
7+ Taskbar Tweaker.exe.1676 .dmp 803,838 .a.. 2014-07-07 5:47:31
7+ Taskbar Tweaker.exe.4864 .dmp 771,829 .a.. 2014-07-05 14:05:44
7+ Taskbar Tweaker .exe 345,088 .a.. 2014-06-27 14:41:24
7+ Taskbar Tweaker.exe.5256 .dmp 793,897 .a.. 2014-06-24 8:59:17
7+ Taskbar Tweaker.exe.860 .dmp 838,142 .a.. 2014-06-16 8:37:18
7+ Taskbar Tweaker.exe.5300 .dmp 757,261 .a.. 2014-06-11 22:13:32
7+ Taskbar Tweaker.exe.5172 .dmp 768,833 .a.. 2014-06-09 8:45:39
7+ Taskbar Tweaker.exe.5312 .dmp 693,318 .a.. 2014-05-29 11:39:18
7+ Taskbar Tweaker .lnk 1,953 .a.. 2013-01-19 2:27:00

you can see now that it is crashing a nearly every 2 days. Before the end of May it used to be very stable. Never a problem.

v4.5.6.2 beta, win 7
Sometimes (!), when there are enough windows that 7tt has a vertical scrollbar, dragging items results in the entire 7tt window flashing for each step of motion in the list.  This is consistent, until some windows are either opened or closed.  Then the behavior usually goes away.  Unfortunately, I have not been able to figure out whether there is any particular window type that causes this to happen, or the exact circumstances under which it happens or goes away.  All I can tell you with pretty good confidence is that it usually occurs the *first time* I try to use 7tt once it will need a scrollbar.

Recall that for my configuration, 7tt uses a window that must be dismissed.

If the grouping is disabled, and you open two instances of a pinned app, one of those two keeps the 'pinned' tag (or whatever) so if you close it the other one is not merged into the pinned item. At the end you have the pinned item 'not-launched' and the second instance, both with the same application ID.
Expected behaviour: the pinned item to not be visible, as there is an instance open.
Current fix: enable/disable again the grouping.

I like the "show thumbnail preview" when hovering. But it would be even better if there was a time delay before the preview pops up. I over-shoot when moving the mouse around the screen, and the previews popup and block my work.