UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred  after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Â Before I release it, I will make sure that everything is working properly and then I will release it.
Mabula (@mabula-admin)
I have recently switched from Windows to Linux and I can no longer change the black point by clicking left or right of the button on the slider. The image redraws but the BP value is unchanged. I can change the BP by grabbing the button, but this is very imprecise. I can no longer make small repeatable changes by clicking the slider. Other sliders are also affected.
I have tested this in beta40 and beta44. I am on Linux Mint 22.3, Cinnamon DE, X11.
It may be that this was a designed change that happened some time ago, as on Windows I was still using the last production version of APP (I know that's ancient history 🙄 ). Or alternatively this may be a minor, Linux only bug. Either way I would like to have the ability to make small repeatable adjustments restored.
thanks
JC
Hi John @connor231,
Thank you very much for reporting this.
I have opened an issue on our issue list to test this on windows versus Linux. I am not aware of this problem so thank you vey much for reporting this.
I understand that you Linux Mint is still using the X11 display server, it is not using the newer Wayland?
It could be that this is specific Linux issue indeed and a thing like this is sometimes caused by our development platform.
Yesterday, I released 2.0.0-beta45 and we have moved again to a newer dev platform OpenJDK 26.0.1, so please try it and let me know if the behaviour is the same or fixed with beta45.
Thanks,
Mabula
Mabula (@mabula-admin)
Wayland is still said to be experimental for Linux Mint, and apparently there are still some reliability issues. My plan is to switch from X11 to Wayland with the next release of Mint, where Wayland is planned to be the default. Probably Dec 2026.
I tested this issue with beta 45 and the results were interesting. I still could not click left or right on the slider and get a small change to the black point. However, as long the scaling factor was zoomed right out (or do I mean in ?) I could now grab the button and make small changes. That's good enough for me to live with - so if you want to demote this to a low priority issue that's ok. Who knows - once we are all on Wayland the problem might go away by itself 😉 .
JC
Hi John @connor231,
Thanks for your feedback.
One of the reasons that I have been upgrading our development platform many times and as soon as possible, it to have as good as possible Wayland support in APP. The latest Java JDK 26 is having much better support for Wayland on Linux than older java versions. The open source community and Oracle are working very hard to rewrite many code for java so that it is fully capable on Linux Wayland. All the old code for X11 related to user interfaces is being rewritten for Wayland.
My testing on Ubuntu with Wayland enabled shows that with JDK26 things are working very well already. Â I know from the java JDK issue list that not everything is fixed yet, but most of the work, especially the critical components are done and work as expected.
I suspect that going forward all will work perfectly fine on Linux with Wayland for APP users.
I keep your issue on my list and I will test it going forward 😉
Mabula
