On my 2012 HTC One S running Android 4.1.1, the recent Boinc's from sometime before Christmas (I think),
has been showing some text as a White font on a slightly less white background,
The Task Tab displays O.K,
The Notice Tab has all the Text in White, except for the url's which are greenish/blue,
the date/time is shown in a black text
On the Projects Tab, all the Project names are shown in White,
while my handle, status, and credit lines are in black text.
On the individual project Tabs, all the text is shown in White Text, the url in blue.
On the preferences Tab everything is in black except for the following:
'Daily transfers limit'
'Power sources for computation'
'Min battery level'
'Pause at CPU usage above'
'Max used storage space'
'Min spare storage'
'Access interval'
'RAM limit'
'Boinc Client log flags'
'GUI log level'
On the Event log Tab all the text in the Client messages, and the GUI Messages is White too.
On my Android 4.4.4 and 4.4.2 devices the text displays normally.
Claggy