Munki Catalog Browser

Includes fixes for:

• #1 Entering text in search field causes app to crash
• #3 Main window sizing is unpredictable and not easily modifiable
• #4 App not usable by non-admin users due to default catalog permissions
• #5 Search bar does not span whole window

For #4, the below will show if Munki Catalog Browser cannot read in the catalogs: