The fifth beta build for paint.net 4.0 is now available. Things are going very well: I only had to fix bugs that I introduced in the last update 
As usual, to install you can either 1) use the built-in updater from a previous 4.0 build, or 2) use the built-in updater from v3.5.11 if you have “Also check for pre-release (beta) builds,” or 3) download it from the forum at: http://forums.getpaint.net/index.php?/topic/28678-paintnet-40-beta-build-5278/
Changes since the last beta build:
- Significantly improved performance of the Ellipse shape
- Fixed the selection outline being drawn in the wrong location when zoomed in
- Fixed a glitch in the Line/Curve tool
- Fixed a rendering glitch and crash in the Move Selected Pixels tool
- Fixed a crash when attempting to draw a shape with zero width and/or zero height
- Updated installer to use .NET 4.5.2
- Fixed a problem that was preventing the installer from working with certain McAfee antivirus configurations (MsiOpenDatabaseW error 110)
- New language: Persian
- New language: Danish
Enjoy!
paint.net blog 
Hi,
It would be nice to include a native photoshop plug-in. The current available plug-in crashes with large file sizes.
You should provide that feedback to the plugin’s author.
This update failed on my Win 8.1 machine. I wish I had kept a full record, but after the install I got a screen that had a whole bunch of unintelligible diagnostic data (I remember seeing paths that begin with “D:\,” which is a Recovery Disk partition on my box) and a whole lot more. The program wouldn’t run and I had no choice but to exit. I then uninstalled Paint.net and installed the full beta download fresh. Same thing. So I uninstalled that and installed v3.5.11 and everything’s now copacetic.
Surprised no one else has reported this. Is it my machine? Seems unlikely, but maybe.
Yeah I’m going to need a bit more than “it gave me a bunch of unintelligible diagnostic data” in order to investigate that. I need the actual diagnostic data 🙂 Or screenshots or a video or something.
Thanks.
I think the move text “icon” bug I reported in build 5226 still exist in this build.
Steps:
1) Open an image with Paint.NET.
2) Open Notepad and type some text on it.
3) Copy the text in Notepad.
4) Click on the image in Paint.NET and use “Ctrl+V” to paste the text onto the image.
5) Out of 10 times, at least 2 to 3 times the move text “icon” at the lower right hand side of the text does not appear (may be a quick flash and then disappeared). We cannot move the text.
Here is the pic:
Regards.
I’ve experienced same, only not needing a copy & paste of external text. I just used the text tool to type in something original. 2 or 3 times out of 6 in same image, the move X dot did not appear or only flickered quickly & disappeared. This was using the latest beta.
That was on a Win7 64 bit PC system.
Great to see progress here. Don’t stress people it is beta. It is meant to have bugs, I am sure they will be worked out naturally and as time goes along.