After typing something on a sign, I cannot see the text unless I look at it from a certain distance and angle. This has lasted for several Minecraft PE updates on my Kindle Fire 2nd Gen.
MCPE-14698
Can't see signs/sign text on Pocket Edition
Resolved
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Thank you for your report! This issue was, however, submitted at an earlier time as MCPE-6450. You may add any information you find relevant in the comment section there.