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What things are not satisfactory? You get activities with the same subject not spread enough over the week?

No, FET usually reports about soft constraints (activity spread) being broken  at the rate of 9-12% which is acceptable. The problem  is about lower year groups where FET tends to generate days with only one period, and some days with 6 periods which is unacceptable. And when I limit those groups to five periods max daily, FET has problems completing tables. Maybe I should leave six periods daily and relax "A student set begins early" constraint. It might help.

Thanks to your report, I decided to add additional user information when he wants to remove the basic constraints. I have released a new snapshot, maybe you would like to test this (see the Snapshots board - the snapshot is 5.12.2-snapshot-24 Jan 2010 - the topic about this snapshot will last until the release of official 5.12.2).

Thanks, I will.

By the way, what FET version are you using? The latest 5.12.1?

I'm using the official 5.12.1 version.

Hi!
Just to inform you that my table is progressing really fine. I have already gotten some usable tables. Maybe 95% acceptable, which is super. With some more tweaking, I think I'll succeed in producing 100% usable table.
I'm using ascTimeTables software alongside with FET and ascTimeTables, with approximately the same constraints, hasn't produced any tables so far. Really good job, Liviu!

For my information, how much time did you spend trying to solve this? And how did you remove the basic space constraints and why?

If you ask for solving the timetable, I am sorry, but the FET seems to get stuck at placing 33 of 333 activities. I think I'll have to find another approach to the problem. Perhaps some other constraints.
As for removing the basic constraints, when I first saw the FET message about missing basic constraints I didn't understand it and I just clicked on ALL button in SPACE tab and manually removed all of the constraints. There were about 60-70 constraints and I really didn't have the patience to read them all, so I removed them all.
Maybe, you should introduce two modes in FET: say, normal and advanced. In normal mode all of the basic settings (like basic space constraint) should be unavailable to a user. And in advanced mode, a user would have a complete control.
And, while we're here, would you care to suggest any tip or workaround for my problem?
Thanks, Liviu once again.

Yes, that solved my problem!
Thank you, Liviu!

Hello!
First off, thank you, dear author, for your software!
I played with FET for some time and I am very satisfied with it. Good job! But now I started a serious work on a timetable for my school and I got stuck.
I entered all required data and time/space constraints. We have a space problem in our school.
6 hours daily per group/teacher/room
12 rooms
12 student groups
16 subjects
19 teachers
a total of 337 hrs weekly (of 370 max possible)
So we have nearly 100% used rooms if we do not count 3 specialized rooms (gym, info and workshop).
I had to enter constraints for all of our teachers/subjects/activities. But now FET won't even start optimizing. It says: "Cannot optimize, because you have no basic space constraints or its weight percentage is lower than 100.0%. Please add a basic space constraint with 100% weight."
I did enter all space constraints and all of my constraints are 100%. Also I paid attention not to 'overlap' constraints, that is, if a teacher has a home room, any further constraints related to him and his subject are not entered anywhere else.
I entered data three times from scratch and it's very tedious, so I'm pretty exhausted.
Any ideas what I could do to make FET start making tables?
Any help appreciated!
Regards!