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Paul,
I had a closer look at your Ha image. You're right, stars appear to be going in different directions. I took a sample of a few in MaximDL (see below) - they are far from pinpoints of light. I'd still contribute this to erratic guiding/corrections considering the stars in the RGB image look really good. If desired, pls log your guiding corrections in MaximDL for both RGB and Ha acquisition (next time your imaging). Guiding logs can be enabled under the CCD camera control dialog box, Guide tab, options - tracking log <enable>. This may allude to where the potential problem resides.
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