PgAdmin 3 crashed when font size was increased

I am using PgAdmin 3 on Postgresql 9.4 on Windows 7. All things work well until I resized browser fonts from 12 to 18. I cant create database, rename table and even change the font size to what it was before. Many things stopped working. I have tried to uninstall Postgres and install another version but still the behavior is same, no change. Please what do I do. Thanks