Not the OP, but will chime in with a similar complaint and some details hoping to illustrate what sounds like the same problem. In my case, foreign property (so 40 yr, SL, MM) with a prior interruption in depreciation requiring me to change checkbox on the depreciation asset worksheet line 43, forcing TT to use tables rather than calculation so that I can enter my own prior depreciation. This has worked successfully for maybe 10 years, setting and prior value is imported forward every year. This year it will not calculate depreciation, instead gives me what I think is the same message as OP gets-- IRS forms not ready (which is very not true!).
If I delete the property and reenter without that worksheet line 43 changed, using standard formula rather than forcing depreciation table, it proceeds (with incorrect depreciation, of course). Checking that line 43 box then causes the result to disappear and be replaced by the OP's message. I believe that *unchecking* the box does NOT then make it work again, but not absolutely certain of that.
Edit to note: downloaded deluxe version. And the superpatch in manual update link above didn't fix it.
