Some Aperture Brushes stop working??

I have recently upgraded my iMac (i5 with 12GB RAM) from 10.8.5 to 10.9.3, upgraded Aperture to 3.5.1. Pretty much my first editing session, and I discover that about half the Aperture brushes have stopped working. This happens on previously unedited images, both JPG and RAW. All referenced images.

These brushes seem to work fine:

• Retouch
• Skin Smoothing
• Burn
• Tint
• Definition
• Vibrancy
• Halo Reduction
• Highlights and Shadows
• Sharpen

These brushes don't work - the brush menu comes up, I can change the setting, but the brush does not show, and I can't brush anything:

• Dodge
• Polarise
• Intensify Contrast
• Contrast
• Saturation
• Blur
• Sharpen
• Noise reduction
• Curves
• Enhance
• Levels

I tried changing various brush settings, doesn't seem to help. I have submitted an a bug report to Apple.

Any ideas from the forum, has anyone run into this?