unable to access the "time" lesson

[Walter57]

there are 7 lessons for time after the color lesson...help, I just reached level seven and wish to advance, however the icon is dead, "el icono está muerto!'

Ayudarme por favor

[Lenkvist]

Did you complete all the skills and lessons before it? Your level is not related to your progression in the tree, you need the complete the skills row by row.

[Walter57]

Yes I've completed all of them up to the lesson for prepositions and one bonus lesson, I do not have enough lingots to get the two remaining bonus lessons, is this what is stopping me?

[Walter57]

fixed it, it was my browser, I switched to IE, for some reason duolingo does not work properly for me using any other browser...like chrome. Gracias por tu aportación