added Known Issue section to readme for issue #24 with a couple worka…

…rounds

readme.md

@@ -66,6 +66,33 @@ afterExpand: null, // function() {},
 onCollapse: null // function(byUser) {}
 ```
 
+## Known Issue
+
+A couple people have reported (in [issue #24](https://github.com/kswedberg/jquery-expander/issues/24)) that after repeatedly expanding and collapsing some text the plugin appears to cause IE9 (and possibly older IEs) to crash. Since the plugin itself doesn't do much when expanding/collapsing, my hunch (confirmed by one of the reporters) is that the crash has to do with animating the opacity of elements. I haven't been able to reproduce the problem on my machine, which leads me to believe that certain graphics settings in Windows must also be contributing to the bug.
+
+I'm not sure what the long-term fix will be, but if you need an immediate fix, you'll need to set options for `expandEffect` and `collapseEffect`, as well as, possibly, `expandSpeed` and `collapseSpeed`.
+
+**Workaround 1**: use these options in your call to `.expander()`, along with any others you might want, to make the text expand and collapse with no transition:
+
+```javascript
+{
+  expandEffect: 'show',
+  expandSpeed: 0,
+  collapseEffect: 'hide',
+  collapseSpeed: 0
+}
+```
+
+**Workaround 2**: use a "sliding" transition with these options in your call to `.expander()`, along with any others you might want:
+
+```javascript
+{
+  expandEffect: 'slideDown',
+  collapseEffect: 'slideUp'
+}
+```
+
+
 ## Demo
 
 A demo is provided in the repo's `demo` directory. Feel free to take the plugin for a spin at [plugins.learningjquery.com/expander/demo/][4]