Thanks Boofredlay.
I have turned off "Enable length snapping" and set "Precision" to 0". Same results.
I'm working on a small house model.
I'm beginning to suspect I don't have a powerful enough computer. π’
I'm using an optical mouse with about 3-400dpi, a 128mg video card, slightly less than 1gig RAM and a 7200rpm HDD on a 100mhz bus. AMD 1.7ghz P4. There is no room for more RAM (poor mobo design). Nor can I upgrade the cpu for the same reasons. I might be able to upgrade the vid card. I'm thinking about going with something that uses DDR. I had good results with a customer's computer after installing one for them. The HDD is brand new. (Seagate Barracuda) I have a 19" LCD monitor.
In other words, it's an old computer. π