Hummingbird File System Issue

Hummingbird cache reports wp-content not writable when it is. I guess I'm going to have to downgrade to the previous version as now its continually (about 150 times a second) throwing

PHP Warning: error_log(/webstuff/blogs/wp-content/wphb-cache/page-caching.log): failed to open stream: No such file or directory in /webstuff/blogs/wp-content/plugins/wp-hummingbird/helpers/wp-hummingbird-helpers-core.php on line 227

Even when the wphb file cache isn't activated.