Try moving BorderStyle as the last setting:

code:
$prgCPUUsage = $picCPUUsage.ProgressBar
$prgCPUUsage.Height = 30
$prgCPUUsage.Width = 30
$prgCPUUsage.Center
$prgCPUUsage.Top = 5
$prgCPUUsage.ForeColor = Lawngreen
$prgCPUUsage.BackColor = Black
$prgCPUUsage.Orientation = 1
$prgCPUUsage.Style = 1
$prgCPUUsage.Max = 100
$prgCPUUsage.BorderStyle = 0

already fixed in next released.