<p>So, I'd like to be able to set the max log file size to 64M, but after doing so with <code>innodb_log_file_size=64M</code> MySQL starts OK, but nothing seems to work properly. </p>

<p><strong>EDIT:</strong> and by properly I mean not at all. Setting other InnoDB variables aren't causing any problems.</p>

<p>How should I go about troubleshooting this one?</p>

Make sure MySQL shuts down cleanly, and delete (or move elsewhere) all
```
ib_logfile*
```
files from MySQL data directory (
```
/var/lib/mysql/
```
usually).
I've tested it and worked for me. Here's
source of this hint
.
InnoDB reports some errors in
```
show table status
```
comment field. You'll find other problems in MySQL error log (
```
hostname.err
```
in MySQL data directory).