Inventory Scan not returning results?

I recently moved to a new organization and was trialing PDQ Inventory and came across an issue I havent seen before, hopefully someone here might have some insight so I can move forward with a purchase if/when all works well:

When inventorying 600+ PC's, I am only getting results back for 66.  When I run the standard inventory, I see it queue up, transition to running, then after 20 seconds or so transitions to saving, but only the last succesful scan date is updated.  The icon remains the same (grey question mark) and no information on the Uptime, Current User, Manufacturer, Model, Serial #, Memory or CPU Name is updated (From the inventory view), nor is any information available in the any of the detail view items.

In looking at the event log on my PC where I installed the trial, I see the following in the Application Log after each 'failed' attempt:

Scan results could not be copied 'C:\ProgramData\Admin Arsenal\PDQ Inventory\Scans\3829.finished.db.gzip'

In looking at one of the PC's in question that was being scanned, I was able to catch this from the output.log file as a scan was attempted:

<Error><Message>The type initializer for 'AdminArsenal.Data.SQLite.SqliteEngine' threw an exception.</Message><Type>System.TypeInitializationException</Type><StackTrace> at AdminArsenal.Data.SQLite.SqliteEngine..ctor(SqliteConnectionString connectionString)
at AdminArsenal.Data.SQLite.SqliteConnectionPool.Checkout()
at AdminArsenal.Data.SQLite.SqliteConnection.Open()
at AdminArsenal.Data.SQLite.SqliteConnection.OpenConnection(SqliteConnectionString connectionString)
at AdminArsenal.PDQInventory.DatabaseManager.Connect(Boolean threadPool)
at AdminArsenal.PDQInventory.ScannerProgram.ExecuteScan(String[] args)</StackTrace><Data Name="HResult">-2146233036</Data><Error><Message>Access is denied</Message><Type>System.ComponentModel.Win32Exception</Type><StackTrace> at AdminArsenal.Data.SQLite.SqliteEngine..cctor()</StackTrace><Data Name="Error Code">5</Data><Data Name="HResult">-2147467259</Data></Error></Error>

The service.log file seems normal, but see that the "Waiting for process to end..." is significantly shorter (10 lines vs 55 or so) than PCs with a successful inventory.

Anyone have any thoughts?