How about today? :)

Well, thats good to hear. Are there any release plans in the near future?

Actually, this was already fixed in Git, but not released yet.

https://github.com/horde/kronolith/commit/249953f186a43c6f3ee604a10c8dfaa61e470868

This bug should also exist with CalDAV connections.

Personally I use CalDAV but ics was easier to setup with the demo.

Greetings,
Terpo

Indeed, it looks like the assignment of the tags to the CATEGORIES 
field in the ics file is broken.

Hello,

My web hoster is using horde for their user E-Mail Accounts and so on.
Personally, I am using the calendar functionallity to syncronize the 
calendar to various computers.

Since last year (or so) something has changed with the category system 
internally somehow because these aren't syncronized properly anymore.

I used the demo account at demo.horde.org to verify that problem.

What is the exact problem?
When creating an event (in Thunderbird or Rainlendar) and give this 
event a category, then this event is created successfully in horde.
Looking it up through the web client tells me, that my category is now a tag.

Problem is now, that when restarting the local calendar app 
(Thunderbird / Rainlendar) the data is fetched from horde again. With 
this syncronization the  category/tag is not transfered anymore. So 
Thunderbird tells me that the event does not has any category at all. 
With that all declared colors (for readability) are lost. With 
Thunderbird and Rainlendar it is possible to connect a category to a 
specific color.

I made some screenshots for my hoster (german, sorry^^)
Creating an event in Thunderbird https://i.imgur.com/gjFRYCq.png
Using the webclient: https://i.imgur.com/yHWUViW.png
After a restart of Thunderbird: https://i.imgur.com/Henrk1b.png
After a restart of Rainlendar: https://i.imgur.com/ZpAsBE0.png

How to test it for yourself?
Log in into your demo application and use demo / demo
Go to the calendar tab. There should be a calendar called tagTest
This calendar is public shared for read and write.
In Thunderbird, in the calendar tab, add a new calendar. Use the .ics 
subscription method:
http://demo.horde.org/rpc.php/kronolith/demo/2_uDOwYqMgwAv25YrjtLDoS.ics
Don't give it a E-Mail address and when Thunderbird asks, give it the 
login credentials (demo / demo).

Now it should be possible to read and create events. It should be 
possible to create a event with a category and confirm the problem 
above.

I think most Calendar apps don't support multiple tags as categories. 
Also, the category stuff was working until last year or so.

I hope this helps to unterstand the bug.

Greetings,
Terpo