Tempo marking disappears if added on the bass clef

Config: MuseScore f5b9240 on Xubuntu 14.10.

Bug 1

Steps:

• Create a new piano score.
• Click on the rest in the first measure of the bass clef.
• Add a tempo marking with Add > Text > Tempo Marking.
• Don't change the default text quarter note = 80, just click anywhere to confirm.

Result: the tempo marking disappears, and cannot be selected.

Workaround: if we undo last change (Ctrl+Z), the tempo marking appears.

Bug 2

Steps:

• Create a new piano score.
• Click on the rest in the first measure of the bass clef.
• Add a tempo marking with Add > Text > Tempo Marking.
• Try to change the default text quarter note = 80.

Result: the default text doesn't disappear, as if it was part of the background, and the new text added is not displayed, as if it was white text on white background.