I have switched to 3.0.152 and get this error when trying to edit any templates using a FieldTypeCache:
ProcessWire: ProcessPageEdit: Method FieldtypeCache::getFieldsTemplate does not exist or is not callable in this context
which returns not content at all.
I have cleared all my caches, refreshed the modules, but to no avail. Switching back to the previous version (3.0.139) corrects the problem.