Sigil 0.5.3 extremely slow to reflect changes
I exported an EPUB from Adobe InDesign CS6 and am tweaking it in Sigil (ver. 0.5.3) before I send it out to be cataloged, but every little change, whether to the CSS or one character, takes an extremely long time to register, and meanwhile just shows an insert character pointer. Saving after each correction doesn't help. And undo doesn't work at all.
I'm using Sigil 0.5.3 on a PC, running Win 7 Home Premium with 4Gb RAM and a 64-bit OS.
Anyone else experiencing this? Any suggestions? Thanks!