Premiere CC - Aspect ratio changes suddenly during playback

**Probable Bug**
This is very strange, and has just recently started happening in Premiere Pro CC after recently updating to OSX Mavericks and the most recent update of Premiere Pro CC. My timeline is 1080p (1.0), 23.976 and I often use the playback at 1/2 or 1/4 resolution feature while building my sequence before rendering.
During playback at 1/4 resolution, either while clicking on the playhead or during playback, the frame in the PROGRAM window will suddenly change from 16:9 to something that looks nearly square (1:1.5 or so) for no apparent reason. It does this both to video footage (which was shot at the same frame rate and resolution) and to graphics imported from Photoshop built 1920 by 1080. They look fine when the sequence is not playing, and change suddenly in playback.
As best I can tell this is a bug, but if by chance I've accidentally tweaked a setting I'd love to know about it because I cannot work like this and my computer is not fast enough to play unrendered footage any faster than the 1/4 setting.

This sounds like the issue described in: http://forums.adobe.com/message/5829431#5829431
If you need 1/4 resolution, you could try setting your Sequence to another Preview File Format, besides I-Frame Only MPEG.

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    http://www.mikeafford.com/blog/2009/03/pal-d1-dv-widescreen-square-pixel-settings-in-after -effects-cs4-vs-cs3/
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    Message was edited by: Ben Bloks

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