Recently Revit has decided it will not "auto-route" wyes, or tees when using the extend command, or dragging the cursor to branch one pipe from another. This was not always the case, and I had been trying to modify the included revit fittings, mainly try to shorten them and tighten bend radii to closer represent actual fittings. I had also tried to add custom pipe diameters, which turned out to bordering on impossible when it comes to updating look-up tables to suit. This was around the same time the wye/tee issue came up, so I'm wondering if it was to do with my attempt to modify lookup tables. However this happens regardless of whether I try to use a tampered-with fitting, or an unmolested one straight out of the Revit library. When I do try to add a wye or tee, I will either get a "no auto-route solution was found" error message, it will attempt to place an elbow in the system instead with terrifying results, or a combination of the 2. Elbows seem to insert normally for the most part. Ducting also works normally. Any suggestions would be appreciated as this has made the already tedious task of modeling sloped drain piping even more tedious.
