For thw WPF and Silverlight ReportViewer, we use XAML rendering - the report is turned into XAML loaded by the viewer.
In this case it is possible to have issues how fonts are measured and interpreted in XAML (WPF technology related). We use GDI methods to measure elements based on their settings and content, based on the applied styles. We logged a task to research the issue. The workarounds are to change the TextBox Style (alignment, font, font size, etc.) to produce a layout without clipped content.
On a side note, external style setters can mess with the XAML in the viewer (TextBlock, Canvas elements and else). Please test excluding any additional styles in the project,
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