Revit: Please enter some other value than what you just entered.

Editing arrowheads I got this error message. It would be even more helpful if it told me what values are allowed.

By testing I concluded that arrowheads can't have an arrow angle more than 90 degrees. I guess I should settle with my 90 degree stair arrow then, although it's not exactly how I want it:

Revit: Please enter a value less than an arbitrary limit.

OK.

Revit: Don't rotate sloped glazings!

So, I need to model a simple, rectangular glazed canopy for a project. I already have a few reference planes to determine the shape and size of the canopy, so let's start drawing our sloped glazing!

I draw the footprint following the reference planes, finish the sketch and...

...Not quite what I was looking for. Let's try it again, maybe it works better if I just draw the sketch as a rectangle oriented to the view axes, and then rotate the finished roof.

Alright, this is looking great! Then just rotate it and...

D'oh! Any more ideas..?

Setting an angle in the grid pattern properties is not only inaccurate but it also doesn't align with the edges. Maybe I'll ditch the type-driven gridlines completely and draw my own ones manually instead...

They snap nicely to the sloped glazing edges! Victory is mine, finally! Now I can change the panels to my own custom curtain panel family that has a customizable gap in between panels. So I edit the sloped glazing type properties, select the panel and...

...and admit defeat. Suddenly my 1000.0000mm x 4000.0000mm panels are apparently no longer rectangular and I can't use any custom panel families on them.

The lesson: don't rotate sloped glazings in odd angles... ever? You can't use custom panels unless the sloped glazing grid is both rectangular and aligned to the coordinate axes.

ArchiCAD: vague error messages

Oh come on.