I just enabled `mod_mem_cache` on an Apache2/PHP5 server running a custom app, and was horrified at the result. All of a sudden the wrong images were being served, and I noticed one time a request for an HTML page served up a CSS page instead! What could be causing this? Config is as follows:

```

CacheEnable mem /
MCacheSize 204800
CacheDefaultExpire 3600
CacheIgnoreHeaders Set-Cookie
MCacheMinObjectSize 100
MCacheMaxObjectSize 5242880
MCacheRemovalAlgorithm LRU

```