No,it's not hacked, it's simply a software compatibility issue because of server upgrade.
I guess all of the PSR Tut Forum users / members will miss it a lot!
But, there are people willing to help to save / host the forum if PSR admin don't figure out any solution or fix and are willing to accept the offer:
https://yamahamusicians.com/forum/viewtopic.php?t=21145

It would be very very sad if all that info and knowledge posted at PSR Tut Forum just disappears...

About 8 years ago I wrote to the administrators and suggested that they update to a newer version of the forum software that worked with responsive web design.
In this way, the display on smaller screens could be much better = readable without zooming in on smartphones.
At the time (about 8 years ago) I got the answer that they couldn't see the need for that, and besides, they were quite satisfied with the software as it was.
This is an example of how, if you don't keep up (just a little) with the development, you will inevitably run into problems at one point or another.
Of course, I don't know if updating 8 years ago could have solved the current problem. But at least the situation couldn't be worse!
Jørgen

You can access the various segments of the site where the lessons, styles, etc...are stored--just not the forum segments. I was able to do this today.

Gary

Right. But I miss the forum more!
Jørgen

I think all do, but in the meantime while we're waiting for news about PSR Tut Forum,
there is a good option available to slow down the worst abstinence. 😉
Many PSR Tut members already found the way:

https://yamahamusicians.com/forum/viewforum.php?f=97

Looks like the decision to close down is permanent, and now also there is added a new sentence at the end of the info that say the PSR Tutorial website will close down as well:


......
Note also, that while this main web site (psrtutorial.com) is still operational, it will be retired some time later this year. I'm afraid this admin is getting too old and worn out to keep it alive. -- Joe

It may be understandable, but terrible news nonetheless.

Maybe someone with ambition can take over PSR Tutorial?

Well, there sure is possibilities, but it depends of PSR Tutorials owner / admins decision to accept the offer.
https://yamahamusicians.com/forum/viewtopic.php?t=21145

We had the same issues at Roland-arranger.com. Site maintenance and dwindling participation made it too much of a faff to keep going.

We have to face it, there simply isn't much of an English speaking player base to continue some of these niche forums running and keeping up with forum software updates is a young man's game.

I am grateful to Kerry for keeping Nigel's dream alive despite the lack of traffic on this site...