<p dir="auto">Affix appears to be removing and re-adding the "affix-bottom" class to the affixed element at the bottom of the screen as the user scrolls in small increments up/down.</p>
<p dir="auto">This is especially noticeable when the footer is very tall, and the affixed element is tall as well.</p>
<p dir="auto">You can see it happening in IE on the bootstrap site overlapping the footer:<br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://camo.githubusercontent.com/64f120bc10591ae29b0b5efb729c7d53fd4267ddeaf5cec97d3b455f08aa22ab/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f3435353238372f323030313037382f36616434643164612d383538362d313165332d386161342d3161636332376665633836352e706e67"><img src="https://camo.githubusercontent.com/64f120bc10591ae29b0b5efb729c7d53fd4267ddeaf5cec97d3b455f08aa22ab/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f3435353238372f323030313037382f36616434643164612d383538362d313165332d386161342d3161636332376665633836352e706e67" alt="image" data-canonical-src="https://f.cloud.github.com/assets/455287/2001078/6ad4d1da-8586-11e3-8aa4-1acc27fec865.png" style="max-width: 100%;"></a></p>
<p dir="auto">Perhaps this has to do with a pixel-rounding issue, or maybe the scroll event handling is strange in IE?</p>
<p dir="auto">I'm experiencing some weird behavior from the affix plugin when using Explorer 10/Win 7.</p>
<p dir="auto">I first noticed the problem when scrolling to the bottom of a page and the affix element jumped back and forth between the wrong position (<em>screenshot 1</em>) and the correct position (<em>screenshot 2</em>).</p>
<p dir="auto">Then I clicked on the page when scrolled to the bottom and the same thing happend.<br>
The affix element jumpes back and forth between the wrong position (<em>screenshot 1</em>) and the correct position (<em>screenshot 2</em>).</p>
<p dir="auto"><em>screenshot 1 - bootstrap-affix-wrong-position</em><br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://camo.githubusercontent.com/55a4f8f96005e2d454c2bbed60236fc244219092773794352149c461f2b41567/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f3735363531362f313836383234312f30303764663631652d373836352d313165332d386562382d3032396434623665666665372e6a7067"><img src="https://camo.githubusercontent.com/55a4f8f96005e2d454c2bbed60236fc244219092773794352149c461f2b41567/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f3735363531362f313836383234312f30303764663631652d373836352d313165332d386562382d3032396434623665666665372e6a7067" alt="screenshot 1 - bootstrap-affix-wrong-position" data-canonical-src="https://f.cloud.github.com/assets/756516/1868241/007df61e-7865-11e3-8eb8-029d4b6effe7.jpg" style="max-width: 100%;"></a></p>
<p dir="auto"><em>screenshot 2 - bootstrap-affix-correct-position</em><br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://camo.githubusercontent.com/d57361650c6ef42bd2a2162fcbf16f084ac4b65c925db2f064645c445c0e728a/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f3735363531362f313836383234332f30343936353531362d373836352d313165332d383237342d6464343238333737323362662e6a7067"><img src="https://camo.githubusercontent.com/d57361650c6ef42bd2a2162fcbf16f084ac4b65c925db2f064645c445c0e728a/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f3735363531362f313836383234332f30343936353531362d373836352d313165332d383237342d6464343238333737323362662e6a7067" alt="screenshot 2 - bootstrap-affix-correct-position" data-canonical-src="https://f.cloud.github.com/assets/756516/1868243/04965516-7865-11e3-8274-dd42837723bf.jpg" style="max-width: 100%;"></a></p>
<p dir="auto">At first I thought did something wrong with my implementation, but I experience the same thing on <a href="http://getbootstrap.com/css/" rel="nofollow">http://getbootstrap.com/css/</a> and the other subpages.</p>
<p dir="auto">I've tested in latest Chrome, Firefox and Safari and the problem seems to only occur with Explorer.</p>