What languages did you use?

(I Tested it for about 1 hour same result every test)

I think this issue in Library\UI\Modules\ModuleHost.vb

Method TryLoadCached

line 335

_cachedContent = System.Text.Encoding.ASCII.GetString(cachedBytes

must be

_cachedContent = System.Text.Encoding.UTF8.GetString(cachedBytes)

and method RenderContents

line 417

Dim moduleContent As Byte() = System.Text.Encoding.ASCII.GetBytes(_cachedOutput)

must be

Dim moduleContent As Byte() = System.Text.Encoding.UTF8.GetBytes(_cachedOutput)

After rebuild all works without problems